二维材料纳尺度摩擦性能研究

发布时间：2017-12-30 19:42

本文关键词：二维材料纳尺度摩擦性能研究　出处：《江苏大学》2017年硕士论文　论文类型：学位论文

【摘要】：石墨烯、二硫化钼等二维材料具有优异的物理、化学、力学性能,在纳器件领域有着巨大的应用前景。在纳尺度下,由于器件尺寸减小,其表面效应增大,与其相关的表面力如表面粘附与摩擦磨损等对器件有着重要影响,严重制约着纳器件系统的发展。同时在微/纳机电系统(M/NEMS)的应用中通常会涉及电场的作用,而电场对表面力也会产生一定的影响。因此为了使这些材料更好地应用于纳器件中,有必要对其外电场作用下的摩擦性能进行深入研究。(1)分别通过给样品和探针加电压的方式,利用原子力显微镜(AFM)研究了外电场作用下化学气相沉积法制备的石墨烯表面的摩擦性能。结果表明针尖加电压时,摩擦力没有明显变化,但给样品加电压时,摩擦力有明显变化,且摩擦力随着电压的增大而增大,电压越大,摩擦力的增幅也越大。且电压对石墨烯摩擦力的影响是完全可逆的。通过对针尖与样品表面黏附力和静电力研究发现,外加电压导致摩擦力增大的原因是电压变大导致针尖与石墨烯表面间静电力变大,进一步导致粘附力变大,所以摩擦力也变大。(2)在大气室温下,利用原子力显微镜导电探针及局域氧化技术在化学气相沉积法制备的石墨烯表面快速构筑了规则的纳米网格结构,并对其表面摩擦和黏附性能进行了表征,结果显示石墨烯转化为氧化石墨烯后摩擦力增加了近6倍,由于表面粗糙度的增加,石墨烯正常区域的粘附力比纳米网格的粘附力稍大。(3)通过微机械剥离法制备得到二硫化钼纳米片,并利用原子力显微镜对其摩擦性质进行了表征。发现对针尖施加外加正向电压时,摩擦力明显增大,且外加电压越大,摩擦力越大;当针尖施加负向电压时,摩擦力具有类似的增大趋势。同时也发现摩擦力随电压的变化是可逆的,显示电压对摩擦力的控制具有很好的开关效应。
[Abstract]:Graphene, molybdenum disulfide and other two-dimensional materials have excellent physical, chemical and mechanical properties, and have great application prospects in the field of nano devices. The surface forces, such as surface adhesion and friction and wear, play an important role in the device. At the same time, the role of electric field is usually involved in the application of micro / nano electromechanical systems (MEMS / NMS). The electric field will also have a certain effect on the surface force. Therefore, in order to make these materials better used in nanodevices. It is necessary to further study the friction properties of the samples under the action of external electric field. The friction properties of graphene surface prepared by chemical vapor deposition under external electric field were studied by atomic force microscope (AFM). The results show that the friction force does not change obviously when the tip of the needle is applied to the voltage. But when the voltage is applied to the sample, the friction force changes obviously, and the friction force increases with the increase of the voltage, and the voltage increases. The effect of voltage on the friction of graphene is completely reversible. The reason for the increase of friction force caused by applied voltage is that the electrostatic force between the tip of the needle and the surface of graphene becomes larger and the adhesion force becomes larger, so the friction force also increases at room temperature in the atmosphere. A regular nano-grid structure was constructed on graphene surface prepared by chemical vapor deposition with atomic force microscope (AFM) conductive probe and local oxidation technique. The surface friction and adhesion properties of graphene were characterized. The results show that the friction force of graphene is increased by nearly 6 times after the conversion of graphene to graphene oxide, due to the increase of surface roughness. The adhesion force of graphene in normal region is slightly larger than that of nano-grid. 3) Molybdenum disulfide nanocrystals were prepared by micromechanical stripping method. The friction properties were characterized by atomic force microscope (AFM). It is found that the friction force increases obviously when the positive voltage is applied to the tip of the needle, and the greater the applied voltage, the greater the friction force. At the same time, it is found that the variation of friction force with voltage is reversible, which shows that the voltage has a good switching effect on the control of friction force.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB30

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